Electromagnet



y 1940- E. H. AYERS 2,207,572

ELECTROMAGNET Filed Aug. 25, 1939 Fig.2.

Inventor-1 3 Edgar: I-i. Ayers, y

Has Attorney.

Patented July 9, 1940 UNITED STATES ELECTROMAGNET Edgar H. Ayers, Schenectady, N. Y., assignor 'to General Electric Company, a corporation of New York Application August 25, 1939,. Serial No. 291,877

3 Claims.

My invention relates to electromagnets and has for its object a simple and low cost electromagnet structure.

In carrying out my invention, I utilize a strip of non-magnetic spring material which is secured to one of the magnetic core members so as to provide an air gap between this member and anotherv magnet core member, this strip being also arranged to position relatively the magnet core members with respect to each other and also engage and hold a magnet coil on one of said core members in a predetermined position.

For a more complete understanding of my invention, reference should be had to the accom- Mi panying drawing in which Fig. l is a plan view of a relay embodying my invention; Fig. 2 is a at Referring to the drawing, I have shown my invention in one form as applied'to a relay iii which is enclosed in a metallic casing ii and has connected thereto a supply transformer 12. The relay comprises an L-shaped magnet core mem- 25 bar l3, which, as shown, is laminated and on one Cooperating with this core member I3 is a straight core member l5, shown .as unlaminated, which forms a third leg of a magnet core. One 30 end of the member I5 is clamped securely to the 36 4 Between the leg clamped a thin strip I 8 made of a suitable nonmagnetic spring material such as bronze. One

function of this strip is to provide an air gap in the magnetic circuit, which it introduces be- 40 tween the two magnet core members by reason of its own non-magnetic properties and thickness. The strip is secured to the magnet mem-' 1. her Ila, hold the magnet member I! against roterial I31: and the member l5 is in the event that the screw becomes loosened.

The relay device further embodies a movable member 2i made of unlaminated magnet mawhich constitutes an armature. This a member ii is provided with a central aperture 22 to receive a projection 23 on the member i5. The member 2i is also provided with side notches 2d and 25 which receive the projections 26 and 27! on the member 55. Also secured to the outer lib face of the armature it is a weight 28 having a projection 29 on its lower side which extends through the aperture 33 in the projection 23 and thereby secures the armature 2i on the core member 95. A flexible contact arm ii is secured 355 to the outside of the weight 2d, the function of the weight being to prevent rebound of the contact arm when it strikes the stationary contact lia. As shown, the parts 2!, 28, at are secured together by means of a screw 32. A tension spring 33 is provided having its ends connected to the projection 29 and the screw it so as to bias the armature 2i and contact arm 3! to their unattracted positions.

While I have shown a particular embodiment of my invention, it will be understood, of course, that I do not wish to be limited thereto, since many modifications may be made, and I, therefore, contemplate by the appended claims to cover any such modifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is: v 1. An electromagnet comprising two core members, means securing a first end of one of said 35 core members to a first end of the other of said core members so that the opposite ends of said core members are spaced apart to form two magnet poles, a coil on one of said core members for producing a flux between said poles passing 40 through said core members, and a member made of non-magnetic material between said first ends to form an air gap between them and secured to one of said core members, said non-magnetic member having a laterally extending portion en- 5 gaging the other end of the other core member to secure said core members in a predetermined relation with respect to each other and engaging the outer end of said coil to hold said coil in position.

apart to form two magnet poles, a coil on said L- member to oneend of said L-shaped core memshaped member, and a member made of nonber, a coil on one arm of said L-shaped member magnetic spring material between said first ends having an inner end engaging the other arm of of said members to form an air gap between them said member, and a relatively thin elongated 5 and secure to said second core member, said member made of non-magnetic spring material 5 non-magnetic member having a laterally extendhaving one end between said members to form an ing portion engaging said other end of said L- air gap between them and secured to said straight shaped member to secure said core members in core member, said member having a laterally a predetermined relationwith respect to each extending forked portion adjacent the other end to hold said coil in position on sai L-shaped end of said L-shaped member to secure said ends member. i in a predetermined relation with respect to each 3. An electromagnet comprising an L-shaped other and engaging the outer end of said coil core member and astraight core member, a single to hold said coil against said other arm.

15 screw securing one end of said straight core 10 other and engaging the outer end i said coil of said straight core member embracing the other 10 EDGAR H. AYERS. 

